Rotating ball nut, Ballscrew Pitch, RPM limits, and my particular build pickle

[JAZZCNC]

Don't waste your time with greasing as it will make no difference and at best only mask the problem, at worst it will mix with what's grinding now and turn the grease into a very nice grinding paste.!! . . Stripping and cleaning ball-screws is a piece of cake and doesn't take long. BUT you must be set up and prepared.

It's a must that you take them apart in a container with reasonably high sides and if the container is steel place something like a kitchen roll in the bottom to stop the balls from bouncing because they have a habit of shooting off like bullets if dropped from any height. DONT put a magnet near them because you'll just magnetize them and make them attract every speck of metal dusty within a 4mile radius...

Regards the rotating nut then I've done a few now and you need at least 25mm pitch and then put a ratio on the ball-nut of 3:1 or 2:1 to get the nut rotation speed down. If using 32mm screws then I'd go with 32mm pitch as it's a common pitch size.

I wouldn't continue with those 5mm pitch screws as you will destroy the ball nut within weeks if you try to spin at anything like 3000rpm, even 2000rpm will eat the plastic tubes away in no time which then causes the balls to jam and stick turning them into 50p pieces as they slide rather than rotate. Cut your losses and sell them on because you will destroy them.